[llvm] Fix a modules-enabled build CI failure (PR #144460)

[Lei Wang via llvm-commits]

wlei-llvm wrote:

> Feel free to merge this PR, but I put up #144464 which includes this fix and adds the missing `#include` to a couple of other files where it was missed, too.

Sounds good, go ahead for the fix, I don't have too much context on this, thanks!

https://github.com/llvm/llvm-project/pull/144460